20427420 has 48 divisors (see below), whose sum is σ = 61598880. Its totient is φ = 5028096.

The previous prime is 20427409. The next prime is 20427437. The reversal of 20427420 is 2472402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12315 + ... + 13874.

It is an arithmetic number, because the mean of its divisors is an integer number (1283310).

Almost surely, 2^20427420 is an apocalyptic number.

20427420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20427420 is an abundant number, since it is smaller than the sum of its proper divisors (41171460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20427420 is a wasteful number, since it uses less digits than its factorization.

20427420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26214 (or 26212 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 20427420 is about 4519.6703419608. The cubic root of 20427420 is about 273.3618087856.

Adding to 20427420 its reverse (2472402), we get a palindrome (22899822).

The spelling of 20427420 in words is "twenty million, four hundred twenty-seven thousand, four hundred twenty".